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HYDRO31325
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HYDRO31325
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Entry Properties
Last modified
8/24/2016 8:55:04 PM
Creation date
11/21/2007 1:32:28 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981041
IBM Index Class Name
Hydrology
Doc Date
4/7/2004
Doc Name
2004 Annaul Impoundment Inspection & 1st Q 2004 Rill & Gully Inspection
From
J.E. Stover & Associates
To
DMG
Permit Index Doc Type
Prof Pond Certifications
Media Type
D
Archive
No
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SNOWCAP COAL COMPANY <br />NORTH AND SOUTH PORTALS <br />IMPOUNDMENT YEARLY INSPECTION <br />In accordance with Rule 4.05.9(14), all impoundments shall be inspected at least yearly <br />to determine if the impoundment has been maintained as designed, and in accordance <br />with the approved plan and the applicable regulations. This yearly inspection is for the <br />impoundments located at the North and South Portals, Unit Train Loadout, North <br />Decline and Refuse Disposal Areas. <br />On March 16, 2004, I performed the required yearly inspections. I, J. E. Stover, have a <br />wide variety of experience in the design and construction of earth fill embankments. <br />Nothing was observed during the inspection that would indicate the ponds have a <br />potential for failure. There was no appearance of erosion, instability, structural <br />weakness or other hazardous conditions. There are no required monitoring procedures <br />or instrumentation other than quarterly and yearly inspections. Unless noted below in <br />the discussion of each pond, there are no aspects which might affect stability and there <br />is no required maintenance. None of the pond/impoundments were discharging during <br />the inspection. <br />Ponds 1 and 2 are located at the Unit Train Loadout. They were dry during the <br />inspection. Volume III, Appendix 13-2, page UTL-5 indicates the combined ponds are <br />designed to contain the 25-year 24 hour event and still have significant excess capacity. <br />The ponds were certified by Larry M. Reschke, P.E., on June 1, 1995. Based on the <br />certification statement and current measurements of the sediment poles, the sediment <br />capacity of the ponds has not been affected since 1995. Therefore, the sediment <br />ponds have significant excess capacity plus the following design capacity: <br /> Water Sediment Total <br />Ponds 1 & 2 - A-F 1.99 0.46 2.45 <br />Pond 6 collects run-off from CRDA-1. The pond was dry during the inspection. There <br />is approximately 2.4-feet of sediment buildup in the pond. This figure is derived from <br />the average length of the three sediment poles located in the pond minus the design <br />depth. The percent of sediment buildup is 44% (2.4' deep divided by 5.4' maximum <br />depth). Based on this sediment buildup and aerial topo maps, the pond has the <br />following estimated capacity: <br /> Water Sediment Total <br />Pond 6 - A-F 1.33 1.01 2.34 <br />-1- <br />
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